[Paraview] Segfault with OpenGL2

[Harald Klimach]

The X+OpenGL2 via pvserver works fine for me now.
However, my colleagues with older local laptops do have some trouble.

My local system uses:
OpenGL Version 4.1 INTEL-10.6.33
OpenGL Renderer Intel Iris Graphics 6100

This works nicely.

With an older graphics card like:
OpenGL Version 3.3 INTEL-10.0.40
OpenGL Renderer Intel HD Graphics 3000 OpenGL Engine

There is only a small 3D screen section that is actually usable, the rest of the screen has garbled output.
The Legend can be displayed correctly on top of the garbled 3D content, and when rotating or moving the
geometry also the complete scenery is correctly shown. As soon as the 3D scenery is still, there are
parts of the screen garbled.

When going back to the legacy OpenGL backend on the server, both kinds of clients
die when trying to render a 3D object.

> Am 12.04.2016 um 22:42 schrieb Harald Klimach <harald at klimachs.de>:
> 
>> Unfortunately I suspect this is an issue with NVIDIA driver. Their EGL support is still brand new and currently seems to be fairly brittle between driver releases so perhaps best to wait until it settles a bit and just stick with X for now :-(.  Are you able to use the X+OpenGL2 (i.e. no egl)  pvserver for remote rendering?
> 
> Yes, as reported in http://paraview.markmail.org/thread/c46ycyk3db4spov4, this
> option seems to work. One weird thing I observed is the different OpenGL version
> strings reported when using OpenGL2+EGL.
> 
> X+OpenGL2 is perfectly fine, I’ll test this a little more extensively.
> Thanks a lot for bearing with me!
> 
> Harald
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